Low Power, Rail-to-Rail Output, Precision JFET Amplifiers Data Sheet AD8641/AD8642/AD8643 FEATURES PIN CONFIGURATIONS Low supply current: 250 A max OUT 1 5 VCC Very low input bias current: 1 pA max AD8641 VEE 2 TOP VIEW Low offset voltage: 750 V max (Not to Scale) +IN 3 Single-supply operation: 5 V to 26 V 4 IN Dual-supply operation: 2.5 V to 13 V Figure 1. 5-Lead SC70 (KS-5) Rail-to-rail output Unity-gain stable NC 1 8 NC AD8641 No phase reversal IN 2 7 VCC SC70 package +IN 3 6 OUT TOP VIEW (Not to Scale) VEE 4 5 NC NC = NO CONNECT APPLICATIONS Figure 2. 8-Lead SOIC (R-8) Line-/battery-powered instruments Photodiode amplifiers OUT A 1 8 V+ AD8642 Precision current sensing IN A 2 7 OUT B Medical instrumentation +IN A 3 6 IN B TOP VIEW (Not to Scale) V 4 5 +IN B Industrial controls Precision filters Figure 3. 8-Lead SOIC (R-8) Portable audio OUT A 1 8 V+ ATE AD8642 IN A 2 7 OUT B TOP VIEW +IN A 3 6 IN B (Not to Scale) GENERAL DESCRIPTION V 4 5 +IN B The AD8641/AD8642/AD8643 are low power, precision JFET Figure 4. 8-Lead MSOP (RM-8) input amplifiers featuring extremely low input bias current and rail-to-rail output. The ability to swing nearly rail-to-rail at the OUT A 1 14 OUT D IN A 2 13 IN D input and rail-to-rail at the output enables designers to buffer +IN A 3 12 +IN D AD8643 CMOS DACs, ASICs, and other wide output swing devices in V+ 4 TOP VIEW 11 V single-supply systems. The outputs remain stable with (Not to Scale) 5 10 +IN B +IN C capacitive loads of more than 500 pF. IN B 6 9 IN C The AD8641/AD8642/AD8643 are suitable for applications OUT B 7 8 OUT C utilizing multichannel boards that require low power to manage Figure 5. 14-Lead SOIC (R-14) heat. Other applications include photodiodes, ATE reference level drivers, battery management, and industrial controls. The AD8641/AD8642/AD8643 are fully specified over the extended industrial temperature range of 40C to +125C. The IN A 1 12 IN D PIN 1 AD8641 is available in 5-lead SC70 and 8-lead SOIC lead-free INDICATOR 11 +IN D +IN A 2 packages. The AD8642 is available in 8-lead MSOP and 8-lead AD8643 V+ 3 10 V TOP VIEW SOIC lead-free packages. The AD8643 is available in 14-lead +IN B 4 9 +IN C SOIC and 16-lead, 3 mm 3 mm, LFCSP lead-free packages. NOTES 1. NC = NO CONNECT. 2. EXPOSED PAD SHOULD BE CONNECTED TO V+. Figure 6. 16-Lead LFCSP (CP-16) (Not Drawn to Scale) Rev. E Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20042011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. IN B 5 16 NC OUT B 6 15 OUT A OUT C 7 14 OUT D IN C 8 13 NC 05072-101 05072-102 05072-064 05072-103 05072-105 05072-104AD8641/AD8642/AD8643 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................5 Applications....................................................................................... 1 Thermal Resistance.......................................................................5 General Description ......................................................................... 1 ESD Caution...................................................................................5 Pin Configurations ........................................................................... 1 Typical Performance Characteristics ..............................................6 Revision History ............................................................................... 2 Outline Dimensions....................................................................... 13 Specifications..................................................................................... 3 Ordering Guide .......................................................................... 15 Electrical Characteristics............................................................. 3 REVISION HISTORY 9/11Rev. D to Rev. E 3/05Rev. 0 to Rev. A Changes to Thermal Resistance Section........................................ 5 Added AD8642 ...................................................................Universal Changes to General Description .....................................................1 7/11Rev. C to Rev. D Added Figure 3 and Figure 4............................................................1 Changes to Figure 6.......................................................................... 1 Changes to Specifications.................................................................3 Changes to Absolute Maximum Ratings........................................5 11/10Rev. B to Rev. C Changes to Figure 22.........................................................................8 Changes to Figure 6.......................................................................... 1 Changes to Figure 23.........................................................................9 Added Thermal Resistance Section and Table 4 .......................... 5 Changes to Figure 41...................................................................... 12 Updated Outline Dimensions ....................................................... 13 Updated Outline Dimensions....................................................... 13 Changes to Ordering Guide .......................................................... 14 Changes to Ordering Guide .......................................................... 15 4/05Rev. A to Rev. B 10/04Initial Version: Revision 0 Added AD8643 ...................................................................Universal Added 14-Lead SOIC .........................................................Universal Added 16-Lead LFCSP.......................................................Universal Updated Outline Dimensions ....................................................... 13 Changes to Ordering Guide .......................................................... 14 Rev. E Page 2 of 16